I tried to drain my hot tub the other night (like I've done a million times in the past) and no water will come out the drain hose. At first the water was trickling out, but then nothing. I've followed the same process as always (Open the cover, pull out the hose and turn it to open) and then nothing. I've checked everything I can think to check. Any suggestions?

try blowing thru the hose first to knock free any debre that may be sitting in there.